Back side purge for stainless welding

I have some 300 series stainless to weld and was wondering if C25 would
be OK to use for the back side purge? I used to have a spare argon
cylinder that I put a regulator and flow meter on for back side purge,
but that is now a C25 cyclinder.
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C25 would be very bad. The CO2 gas in C25 is not inert.
Nitrogen is a lower cost replacement for Argon, if welding Stainless, but not if welding titanium.
Reply to
Ernie Leimkuhler
Thanks, I was afraid you would say that...
I was hoping that I could squeak by with it as a back side purge, but I want this to be right.
Regards, BobH
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